I have a "Have You Seen...?" forum just like here on Xenforo where I post about new and even existing features so members know what there is. It works very well.Members of my forum don't read this site so I'd imagine it's something they will never find out unless they stumble across it.
That's actually a pretty good suggestion. You could use it for a series of "did you know?" announcements. Do you know of the top of your head if there is there a limit on characters on the phrase?Edit the "Write your reply..." phrase to include some text about copying and pasting, dragging and dropping.
That's what I've done for most of the images on addons here, as well as some screenshots. Takes out a step, and also stops me cluttering my desktop (as that's where I save them).I use copy and paste almost exclusively now.
Snipping tool -> c&p, job done.